Amazon S3 generates a pair of request IDs for each request that it processes. The values of the S3 request ID pair for any failed S3 actions help AWS Support identify and troubleshoot the issue in a timely manner.

You can get Amazon S3 request ID pairs from HTTP headers and verbose logs by using several different methods. For more information, see Getting my Amazon S3 request IDs. The names used to describe each half of an S3 request ID pair can vary, depending on the retrieval method. This table lists three commonly used methods for retrieving S3 request ID pairs and the corresponding names used for each half:

Access method

First name in pair

Second name in pair

HTTP response header

x-amz-request-id

x-amz-id-2

HTTP response body (returned on errors only)

RequestId

HostId

AWS SDK request

AWS Request ID

S3 Extended Request ID

For example, an S3 request ID pair returned in an HTTP request header resembles the following: